Double-acting pump.



H. C. WRISTEN & J. W. HENDERSON.

DOUBLE ACTING PUMP.

APPLICATION r1150 MAR. 5. 1915.

Patented Jan. 9, 1917.

TTNTTE TA PATNT ET TQE.

HENRY C. WRISTEN AND JAMES \V. HENDERSON, OF DEXTER, NE'W MEXIGO.

DOUBLE-ACTING PUMP.

Specification of Letters Patent.

Patented J an. 9, 1917.

Application filed March 5, 1915. i Serial No. 12,368.

T all whom it may concern:

Be it known that we, HENRY C. lVnis'rnN and JAMES V HENDERSON, citizens of the United States, residing at Dexter, in the county of Chaves, State of New Mexico, have invented a new and useful Double-Acting Pump, of which the following is a specification.

The present invention appertains to pumps, and aims to provide anovel and improved double acting pump.

The object of the invention is the provision of a double acting pump of unique construction, and adapted particularly for use in deep or drilled wells, and embodying novel means for actuating the two pistons or plungers in opposite directions, whereby the water or liquid will be elevated during each stroke of the pump rod, to thereby provide a practically continuous upward flow of the water.

It is also within the scope of the invention to provide a double acting pump which is comparatively simple and inexpensive in construction, and which is practical and cilicient in operation.

lVith the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed, without departing from the spirit of the invention.

The invention is illustrated in the accompanying drawing, wherein v Figure l is a vertical on longitudinal section of the improved pump, parts being broken away. Figs. 2, 3, 4L, and 6 are sec tional views, taken on the lines 22, 33, 4.t, 55 and 66, respectively, of Fig. 1.

In the drawing, the numeral 1 designates an upright well casing or cylinder, which is provided with a suitable check or flap valve 2 at its lower end for supporting the column of water within the casing which is drawn upwardly therein through the check or flap valve 2.

A pair of pistons or plungers 3 and i are mounted for reciprocatory movements with in the casing 1 at vertically spaced points therein, and each of the pistons embodies a pair of annular plates 5 and 6 having a leather cup or packing 7 clamped therebetween and engaging the walls of the casing.

Each of the pistons is also provided with a flap or clack valve 8 riveted or otherwise secured upon the upper annular plate 5 to normally seat upon the said plate over the central opening of the piston. The valves 2 and 8 thus permit of the upward flow of water through the casing and pistons, but prevent the downward flow of the water, as will be apparent.

The actuating means for the upper piston or plunger 4 embodies a vertical or longitudinal doubled rack bar 9 thereabove and disposed axially within the casing 1 above the piston 4, the bar 9 projecting upwardly and being adapted for attachment to the reciprocatory pump rod (not shown). The bar 9 is provided with rack teeth 10 along its opposite edges, and the lower end of the bar 9 is provided with a yoke 11 arranged in a plane at right angles to the plane of the bar 9. The ends of the yoke 11 have reduced portions 12 engaged through the parts of the piston 1 and bearing lower nuts 13 which clamp the parts of the piston 1 together, and which also secure the piston 4: to the yoke 11 of the bar 9. The upper end of the bar 9 is provided with a reduced threaded portion 1% having a nut 15 thereon whereby the upper end of the bar 9 may be readily attached to the lower end of the pump rod. A slotted yoke 16 is fitted within the casing 1 at a point spaced sufliciently above the up per piston 4, and the bar 9 is slidable snugly between the sides of the slot of the yoke 16 between the ends thereof.

The actuating means for reciprocating the lower piston 3 embodies a pair of parallel upright or longitudinal rods 17 which are disposed adjacent opposite walls of the casing 1, and which lie in the plane of the bar 9. The rods 17 are slidable through the piston 4s and have reduced lower ends 18 engaged through the parts of the piston 3 and bearing nuts 19 for clamping the parts of the piston 3 together and for attaching the piston 3 securely to the lower ends of the said rods. The rods 17 lie in a plane at right angles to the plane of the yoke 11. The upper end portions of the rods 17 are provided above the upper piston 4t with outwardly ofiset racks 22 passing slidably through the yoke 16. The racks 22 pass through the end portions of the slot of the yoke 16 and those edges of the racks 22 opposite the teeth bear against the ends of the yoke 16. The upper ends of the racks 22 are connected by a pair of opposite bars or strips 23 which are terminally riveted to the upper ends of the racks 22, and which form a yoke, through which the rack bar 9 is slidable.

The racks 9 and 22 are operatively connected through the medium of a pair of pinions or gear wheels 24: journaled within the yoke 16 between the racks and interme shing with the racks 9 and 22. The pinions or gear wheels 24- are mounted upon spindles or axles 25 carried by the yoke 16. Thus, when the rack 9 is reciprocated, the racks 22 will be reciprocated with the same velocity in the opposite directions and since the racks 9 and 22 carry the respective pistons l and 3, the pistons will be reciprocated simultaneously in opposite directions. 7

In operation, when the rack 9 is lowered, the upper piston at will be moved clownardly, while the lower piston 3 will be raised. Consequently, the lower piston 3 will draw the water up through the lower check' valve 2, and will also raise the water above the piston 3 through the upper piston 4:. Then, when the rack 9 is moved upwardly, the upper piston 1 will raise the water. above the same, while the lower piston 3 will be lowered, and its valve 8 will open to allow the water to pass U1 )WE11Cll' through the piston 3 while the said piston is being lowered. As a result, upon boththe upward and downward strokes of the rack bar 9 to which a pump rod is connected, there will be a lifting or raising action on the water, and in this manner the water will be raised in a practically continuous stream during the reciprocation of the parts.

Attention is directed to the manner in which the several component parts of the having smooth portions 17 slidably received in the guides, and a lower piston connected to the outer rack bars. As shown in Fig. 1, the outer rack bars are bent as shown at 100 to define shoulders. hen the upper piston moves upwardly and when the outer rack bars and lower piston move downwardly, the guides 21 coact with the shoulders 100 to prevent the upper piston from riding onto the teeth of the rack bars 22, to the damage of both the teeth and the piston.

It will be noted moreover that the upper piston rod is of broad fiat construction to testes of this patent may be obtained for five cents each, by addressing the Goinmissionr of Patents,

operate readily betwen the parallel bars or members 23 of the yoke which connects the upper ends of the members of the lower piston rod, the upper piston rod having the gear teeth on its edges for engagement with the pinions 24, while the members of the lower piston rod, the teeth of which engage with the said pinions, are backed by the guide 16 to prevent relative displace: ment of the parts. the upper flat piston rod in the direction in which there might be a possibility of deflection, the arms of the yoke 11 by which said upper piston rod is connected with the upper piston, are disposed in a plane per pendicular to the width of said upper piston rod while the members of the lower piston rod are disposed in a plane perpendicu lar to that of the arms of the yoke of said upper piston rod, andby passing through guides in the upper piston, serve to insure the steadiness of the latter. Deflection of the upper piston rod in the direction of its wldth is prevented by the engagement of the edge gear teeth thereof with the pinions, while deflection in the other direction or perpendicular to the plane of said width, is prevented by said yoke 11 and the yoke 23 which connects the upper ends of the n em bers of the lower piston rod". This arrangement insures relative rigidity of the parts and accuracy of movement without undue friction or resistance. 7

Having thus described the invention, what is claimed as new is In a pump having a barrel and upper and lower oppositely movable pistons, an upper flat piston rod connected with the upper piston by a yoke disposed with its arms in a, plane perpendicular to the width of said rod, a lower piston rod consisting of members disposed in a plane perpendicular to the plane of the arms of said yoke and extendingthrough the upper piston, a yoke connecting the upper ends of the-members of said lower piston rod and forming a guide for the upper end of the upper piston rod, pinions interposed between said upper piston rod and the members of the lower piston rod and engaging with racks on the latter and on the edges of the former, and a guide arranged in contact with the outer sides of the members of the lower piston rod for maintaining the parts'in position in the plane ofoperation of said pinions.

In testimony that we claim the foregoing as our own, we have hereto affixed our signatures in the presence of two witnesses.

HENRY C. l VRISTEN. JAMES W. HENDERSON. Witnesses:

VA. T. STONE,

AGNES WHITMAN.

Washington, I). G.

In order to strengthen 

